For users who still have the 2018 installer (v8.6 or v8.7), it was designed for older macOS environments: Getting Started with Sketchbook Pro on macOS and Windows
If you are looking for a legitimate way to access Sketchbook on a Mac, your options depend on your history with the app: Autodesk SketchBook Pro 2018 for Mac Free Download
If you previously "purchased" or downloaded Autodesk SketchBook from the Mac App Store while it was free, you can still reinstall it by going to your App Store Account and checking your purchase history. For users who still have the 2018 installer (v8
Autodesk SketchBook Pro 2018 for Mac is no longer available for direct download from Autodesk, as the software has been transitioned to an independent company, . While Autodesk once offered a fully featured version of SketchBook for free starting in April 2018, they discontinued all downloads and updates on June 30, 2021. Official Download & Reinstallation Options Autodesk SketchBook Pro 2018 for Mac Free Download
The current supported version, Sketchbook Pro , is available for a one-time purchase of $19.99 on the Mac App Store. Historical System Requirements (2018 Version)
If you downloaded the installer directly from Autodesk in the past and kept a backup of the original package, you can still use it to reinstall the software.